Posted by John S. on Saturday, 24 December 2016, at 3:52 p.m., in response to 1873 Trapdoor serial number, posted by Martin Henderson on Saturday, 24 December 2016, at 3:07 p.m.

Sorry, no info on 81810. Nearby numbers seem to all be rifles, not carbines. Nearby numbers are typical of the varied uses- some with state volunteer units during the Spanish American War, some with Indian Scouts, and many with no surviving records which might have done something exciting, or more likely nothing exciting at all.